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/* RCSid: $Id: rast.h,v 1.2 2003/07/14 22:24:00 schorsch Exp $ */
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/*
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* Structures for line segment output to raster files
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*/
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#ifndef _RAD_RAST_H_
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#define _RAD_RAST_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define NUMSCANS 16 /* number of scanlines per block */
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typedef struct { /* raster scanline block */
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unsigned char *cols[NUMSCANS];
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int ybot, ytop; /* ybot is scan[0] */
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int xleft, xright;
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int width;
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} SCANBLOCK;
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extern int ydown; /* y going down? */
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extern int minwidth; /* minimum line width */
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extern SCANBLOCK outblock; /* output span */
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#define IBLK 0 /* index for black */
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#define IRED 1
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#define IGRN 2
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#define IBLU 3
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#define IYEL 4
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#define IMAG 5
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#define ICYN 6
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#define IWHT 7
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#define pixtog(x,y,c) { register unsigned char \
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*cp = outblock.cols[(y)-outblock.ybot]+(x); \
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*cp = ((~*cp ^ (c)<<3)&070) | (*cp&07); }
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#define pixmix(x,y,c) (outblock.cols[(y)-outblock.ybot][x] &= 070|(c))
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#define someabove(p,y) (CONV((p)->xy[YMX],dysiz) > (y))
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#define somebelow(p,y) (CONV((p)->xy[YMN],dysiz) < (y))
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#define inthis(p) (ydown ? someabove(p,outblock.ybot-1) : \
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somebelow(p,outblock.ytop+1))
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#define innext(p) (ydown ? somebelow(p,outblock.ybot) : \
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someabove(p,outblock.ytop))
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_RAST_H_ */
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